Heparin. Absorbed slightly. The connection with plasma proteins is up to 95%, the volume of distribution is 0.06 l / kg. It does not penetrate the placenta and into breast milk. Intensively captured by endothelial cells and cells of the mononuclear-macrophage system, concentrated in the liver and spleen. It is metabolized in the liver by N-desulfamidase and heparinase of platelets, which is included in the metabolism of heparin at later stages. Desulfated molecules under the influence of kidney endoglycosidase are converted into low-molecular fragments.The half-life is 1-6 hours (on the average - 1.5 hours); increases with obesity, hepatic and / or renal insufficiency; decreases with thromboembolism of the pulmonary artery, infections, malignant tumors.
It is excreted by the kidneys, mainly in the form of inactive metabolites, and only with the introduction of high doses is it possible to excrete (up to 50%) in an unnamed form. It is not excreted by hemodialysis.
Benzocaine for external use is practically not absorbed. It is hydrolyzed by plasma and hepatic cholinesterase to metabolites of parahaminobenzoic acid and is excreted in the urine.
Benzyl nicotinate. Pharmacokinetics has not been studied.